1. Measurement with Isotropic Broadband Probe

The isotropic broadband probe works in the area from 200 KHz to 40 GHz. It measures the total field of electromagnetic radiation, i.e. the sum of all field components at the frequency range from 200 KHz to 40 GHz. It is directly connected to the computer with the accessory software for the spectrum analyzing. The measuring was made at a distance of 30 cm.

· Analysis of the measurement with isotropic broadband probe

The measuring was made in three phases. In the first phase the noise level was measured, i.e. the field round the cellular phone (no protection) while being motionless (just switched on). The measured noise level varied from 1.5 V/M to 2 V/m (graph 1.).

In the second phase the call to the cellular phone (without protection) was made. From the graph it is clear that the field round the cellular phone at that moment had the value of 5.5 V/m, meaning the maximum value. Later on it dropped between 3 V/m and 3.5 V/m.

In the third phase, when the cellular phone (with protection) made a call, the field was measured. The electric field strength level flushed with the noise level.

Results obtained from both methods are similar to each other and comparable as well.